2010A&A...518L.124M -
Astronomy and Astrophysics, volume 518, L124-124 (2010/7-2)
Gas in the protoplanetary disc of HD 169142: Herschel's view.
MEEUS G., PINTE C., WOITKE P., MONTESINOS B., MENDIGUTIA I., RIVIERE-MARICHALAR P., EIROA C., MATHEWS G.S., VANDENBUSSCHE B., HOWARD C.D., ROBERGE A., SANDELL G., DUCHENE G., MENARD F., GRADY C.A., DENT W.R.F., KAMP I., AUGEREAU J.-C., THI W.F., TILLING I., ALACID J.M., ANDREWS S., ARDILA D.R., ARESU G., BARRADO D., BRITTAIN S., CIARDI D.R., DANCHI W., FEDELE D., DE GREGORIO-MONSALVO I., HERAS A., HUELAMO N., KRIVOV A., LEBRETON J., LISEAU R., MARTIN-ZAIDI C., MORA A., MORALES-CALDERON M., NOMURA H., PANTIN E., PASCUCCI I., PHILLIPS N., PODIO L., POELMAN D.R., RAMSAY S., RIAZ B., RICE K., SOLANO E., WALKER H., WHITE G.J., WILLIAMS J.P. and WRIGHT G.
Abstract (from CDS):
In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs. To constrain the gas properties in the outer disc, we observed the star at several key gas-lines, including [OI] 63.2 and 145.5µm, [CII] 157.7µm, CO 72.8 and 90.2µm, and o-H2O 78.7 and 179.5µm. We only detect the [OI] 63.2µm line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and 12/13CO data obtained with the Submillimeter Array. Furthermore, we derive accurate stellar parameters from optical spectra and UV to mm photometry. We model the dust continuum with the 3D radiative transfer code MCFOST and use this model as an input to analyse the gas lines with the thermo-chemical code ProDiMo. Our dataset is consistent with a simple model in which the gas and dust are well-mixed in a disc with a continuous structure between 20 and 200AU, but this is not a unique solution. Our modelling effort allows us to constrain the gas-to-dust mass ratio as well as the relative abundance of the PAHs in the disc by simultaneously fitting the lines of several species that originate in different regions. Our results are inconsistent with a gas-poor disc with a large UV excess; a gas mass of 5.0±2.0x10–3M☉ is still present in this disc, in agreement with earlier CO observations.
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Journal keyword(s):
planetary systems - circumstellar matter - stars: pre-main sequence - protoplanetary disks - infrared: planetary systems
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
References (353 between 1850 and 2021) (Total 353)
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